You can use which ever map provider that gives you the best result. For North America, I find Navteq/HERE map better but TomTom POI more complete. For Europe I would think TomTom map is better. But everyone have their own favorites. One benefit of NNG is that you can use different maps and different poi's vendors.
HE = HERE
TT = TomTom
OT = Other



Likes: 





Bookmarks